Add a useful but tragic helpful tip

Add some practical tutorials

Add a more complicated mask tutorial, showing edge cases

Add a tutorial for write/test masks

Add a tutorial for creating your own world windows

Add an example for not rending sections of props

Add a big stencil test entity

Add a tutorial that only covers ClearBUffersObeyStencil

Number the tutorials for easy following

Add a basic tutorial for each of the operations

Add a stupid example

First example!

Hello world

Initial commit